forked from len0rd/rockbox
a2cc7546d8
same vein as bootdata but for devices that need to pass info back to a running firmware Change-Id: I0cdcdc0475804dfbbee415ab487104ae8fc8ac69
88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
*
|
|
* Copyright (C) 2024 by William Wilgus
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "devicedata.h"
|
|
#include "crc32.h"
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include "debug.h"
|
|
|
|
#ifndef BOOTLOADER
|
|
void verify_device_data(void) INIT_ATTR;
|
|
void verify_device_data(void)
|
|
{
|
|
DEBUGF("%s", __func__);
|
|
/* verify payload with checksum */
|
|
uint32_t crc = crc_32(device_data.payload, device_data.length, 0xffffffff);
|
|
if (crc == device_data.crc)
|
|
return; /* return if data is valid */
|
|
|
|
/* Write the default if data is invalid */
|
|
memset(device_data.payload, 0xff, DEVICE_DATA_PAYLOAD_SIZE); /* Invalid data */
|
|
device_data.length = DEVICE_DATA_PAYLOAD_SIZE;
|
|
device_data.crc = crc_32(device_data.payload, device_data.length, 0xffffffff);
|
|
|
|
}
|
|
|
|
/******************************************************************************/
|
|
#endif /* ndef BOOTLOADER ******************************************************/
|
|
/******************************************************************************/
|
|
|
|
#if defined(HAVE_DEVICEDATA)
|
|
void __attribute__((weak)) fill_devicedata(struct device_data_t *data)
|
|
{
|
|
memset(data->payload, 0xff, data->length);
|
|
}
|
|
#endif
|
|
|
|
/* Write bootdata into location in FIRMWARE marked by magic header
|
|
* Assumes buffer is already loaded with the firmware image
|
|
* We just need to find the location and write data into the
|
|
* payload region along with the crc for later verification and use.
|
|
* Returns payload len on success,
|
|
* On error returns false
|
|
*/
|
|
bool write_devicedata(unsigned char* buf, int len)
|
|
{
|
|
int search_len = MIN(len, DEVICE_DATA_SEARCH_SIZE) - sizeof(struct device_data_t);
|
|
|
|
/* search for decvice data header prior to search_len */
|
|
for(int i = 0; i < search_len; i++)
|
|
{
|
|
struct device_data_t *data = (struct device_data_t *)&buf[i];
|
|
if (data->magic[0] != DEVICE_DATA_MAGIC0 ||
|
|
data->magic[1] != DEVICE_DATA_MAGIC1)
|
|
continue;
|
|
|
|
/* Ignore it if the length extends past the end of the buffer. */
|
|
int data_len = offsetof(struct device_data_t, payload) + data->length;
|
|
if (i + data_len > len)
|
|
continue;
|
|
|
|
fill_devicedata(data);
|
|
|
|
/* Calculate payload CRC */
|
|
data->crc = crc_32(data->payload, data->length, 0xffffffff);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|